Solutions in closed form of the complex potentials and the field intensity factors are given for a single circular-arc crack.
对单个圆弧裂纹的情形，给出了封闭形式的复函数解和场强度因子。
2
A microcomputer controlled IGBT inverter power source for pulsed MIG welding is developed. It realizes the self adaptive control and closed loop control of arc voltage in pulsed MIG welding process.
建立了微机控制和IGBT逆变式脉冲MIG焊电源系统，实现了MIG焊接过程弧压自适应闭环控制。
3
The pipe connector of the invention adopts the opening annular outer case with the structure connected by two arc-shaped case body hinges, and can be conveniently opened and closed.